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In biochemistry, lipase (/ ˈ l aɪ p eɪ s, ˈ l aɪ p eɪ z / LY-payss, LY-payz) refers to a class of enzymes that catalyzes the hydrolysis of fats. Some lipases display broad substrate scope including esters of cholesterol , phospholipids , and of lipid-soluble vitamins [ 1 ] [ 2 ] and sphingomyelinases ; [ 3 ] however, these are usually ...
Induced by high epinephrine and low insulin levels in the blood, epinephrine binds to beta-adrenergic receptors on the cell membrane of the adipocyte, which causes cAMP to be generated inside the cell. The cAMP activates protein kinases, which phosphorylate and thus activate hormone-sensitive lipases in the adipocyte.
Elevated levels of the alkaline phosphatase enzyme are reported among those who have obesity. A study reported there were higher serum levels of alkaline phosphatase in obese than in the non-obese. With elevated alkaline phosphatase levels, there is an increase in disproportionate intracellular fat depots and thereby releasing itself into the ...
Lipoprotein lipase deficiency leads to hypertriglyceridemia (elevated levels of triglycerides in the bloodstream). [35] In mice, overexpression of LPL has been shown to cause insulin resistance, [36] [37] and to promote obesity. [30] A high adipose tissue LPL response to a high-carbohydrate diet may predispose toward fat gain.
Other causes include high levels of blood fats, high blood calcium, some medications, and certain genetic disorders, such as cystic fibrosis, among others. [1] Smoking increases the risk of both acute and chronic pancreatitis. [3] [4] Diagnosis of acute pancreatitis is based on a threefold increase in the blood of either amylase or lipase. [1]
Hepatic lipase (HL), also called hepatic triglyceride lipase (HTGL) or LIPC (for "lipase, hepatic"), is a form of lipase, catalyzing the hydrolysis of triacylglyceride. Hepatic lipase is coded by chromosome 15 and its gene is also often referred to as HTGL or LIPC . [ 5 ]
Individuals with the disorder are mostly heterozygous in an inactivating mutation of the gene encoding for lipoprotein lipase (LPL). This sole mutation can markedly elevate serum triglyceride levels. However, when combined with other medications or pathologies it can further elevate serum triglyceride levels to pathologic levels. [1]
Triglyceride level is an independent risk factor for cardiovascular disease and/or metabolic syndrome. [37] Food intake prior to testing may cause elevated levels, up to 20%. Normal level is defined as less than 150 mg/dL. [46] Borderline high is defined as 150 to 199 mg/dL. [46] High level is between 200 and 499 mg/dL. [46]